As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB, THE FLIGHT CREW REPORTED SMOKE IN THE CABIN AND AIR CONDITIONING TEMPERATURE HIGH. THE FLIGHT CREW DONNED THEIR OXYGEN MASKS AND DIVERTED BACK TO BNA. MAINTENANCE WAS CONTACTED TO INSPECT AND REPAIR THE AIRCRAFT. THE AIR CYCLE MACHINE WAS FOUND TO BE SEIZED. THE ACM WAS REPLACED AND OPERATIONAL CHECKS TO BE COMPLETED. IF FURTHER DISCREPANCIES ARE DISCOVERED, A SUPPLEMENTAL SDR WILL BE SUBMITTED.